{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Whole body electrolyte and trace metal profiles were not affected by exposure to TiO ( 2 ) , and there were no changes in Na ( + ) K ( + ) - ATPase activity in brain , gill or liver tissues ."}
{"Chemical": ["TiO ( 2 )", "Na ( + )", "K ( + )"]}